thirteen yr old boy

can anyone help me get good abs with workouts that i can just do at home. i do some workouts at home daily to help build some muscle without the help of weights that wud stunt my growth: push ups, sit ups, squats,half jumping jacks (i dont move my arms just the legs), and sort of a backward push up to help on muscles on the back of my arm. I can do like 400 sits up no problem and thats like a minimum for me yesterday. It used to be like 225 sit ups was maximum but something just happened and idk now i can suddenly do 400 like its nothing. i can do like 25 pushups straight but 35 is like my maximum if i stop and like take a breather (while still in push up position) please help me actually get visual pack of abs, stronger arm muscle, and maybe help with endurance. im still 13 and pretty tall maybe 5'8'' or an inch or 2 taller than that and im pretty skinny like 125 pounds.

im doing a journalism thingy for ela. im doing crisis' in america. I need some really interesting topics concerning america that my group can write about. right now my group wants to change topics which i find useless. We've already decided to do things like obesity, bullying, and other useless topics like health insurance. I need alot of topics cuz right now my topics are kind of shitty (please). The topics can't be silly xD please (in an eighth grade)

im so screwed right now..i need this paper to be handed in...or else im so screweed that ill probably get a 60 or worse in my report card. T-T im seeing worse case scenario. This paper is like the main thing for this marking period. Its like 3 weeks late......>.> i know this seems like its all my fault and it is...i waited till last minute...then after a few days i felt lazy and hopeless like there was no point in doing it. Ive re-thought everything and i need to try to convince my teacher. She is from the bronx so she's reasonable and strict. Im in eighth grade and she probably wont accept it but i need to try. Id rather try to get an 80 then give up and get like a 40 T-T im already considering overloading on reading logs and im gonna ask for extra credit....i dont wanna fail this subject and affecting the others..i wanna make my mom proud cuz i feel like shes losing hope

im a 13 yr old boy...been playing for more than a year...and its not fun wen an A,B,C, or D players call next cuz ill be able to score maybe a few points but thats it...i wanna be better so pro handball players dont see me as a scrub where they can just steal the court. i wanna learn different techniques like whipping, powering (which i still dont know how even though there are ppl weaker than me who can power like crazy), and all that other stuff.